R&S SMB Preparation, Recommended Test Frequencies and Levels
1407.0806.82 1.7 E-5
Preparation, Recommended Test Frequencies and Levels
To ensure proper conditions for the performance test and prevent setting errors, the instrument must be
prepared as follows:
• Allow for a minimum warm-up time of 30 minutes at ambient temperature.
•
Carry out all internal adjustments (see operating manual, chapter 4, section "Internal Adjustment -
Setup-System").
• Press
PRESET to establish a defined initial state before configuring a new measurement.
The following sections describe the procedures for checking the rated values. The values are specified
in the data sheet. Additional uncertainties introduced by the measurement equipment must be taken
into account when checking the rated values.
The following table lists the important internal switch point frequencies and the recommended
measurement frequencies derived from these frequencies. We recommend measurements at these
frequencies unless particular test frequencies are specified. In the following, RF
m
ax
is the maximal settable
RF (depending on installed options).
Table 1-2 Range limits, main test frequencies for CW Mode
Range Frequency Hardware switching points Recommended test frequencies
Direct DDS
Synthesis
9 kHz f 23.4375 MHz
- 9 kHz; 200 kHz; 1 MHz; 5 MHz;
10 MHz;
23.4375 MHz
Divider/128
23.4375 MHz < f 46.875 MHz
-
23.438 MHz; 46.875 MHz
Divider /64
46.875 MHz < f 93.75 MHz
47MHz; 66MHz
46.885 MHz; 65.9 MHz; 93.75 MHz
Divider /32
93.75 MHz < f 187.5 MHz
94 MHz; 144 MHz; 187 MHz
93.76 MHz; 143.9 MHz; 186.9 MHz
Divider /16
187.5 MHz < f 375 MHz
265 MHz; 375MHz
187.6 MHz; 264.9 MHz; 374.9 MHz
Divider /8
375 MHz < f 750 MHz
530MHz; 750MHz
375.1 MHz; 529.9 MHz; 749.9 MHz
Divider /4
750 MHz < f 1500 MHz
1060MHz; 1500 MHz
750.1 MHz; 1059.9 MHz; 1100 MHz;
1499.9 MHz
Divider /2
1500 MHz < f 3 GHz
2121 MHz; 3000 MHz
1500.1 MHz; 2120.9 MHz; 2200 MHz;
2999.9 MHz
Base octave
3 GHz < f 6 GHz
4242 MHz
3000.1 MHz; 3200 MHz; 4241.9 MHz; 5
GHz; 6 GHz
RF
max
ist the maximum output frequency of the instrument according to its frequency option (1.1 GHz,
2.2 GHz, 3.2 GHz or 6 GHz).
For high-resolution measurements in the entire frequency range, a logarithmic frequency grid in 1-2-5
sequence is recommended up to 50 MHz; above this value, linear 50 MHz steps should be used up to
the upper limit frequency.
The recommended test levels are at the upper and lower switching threshold of the attenuator. The
electronic attenuator of the DUT is switched depending on frequency, modulation parameters and level
according to an internal stored table in approximately 5 dB steps. The switching thresholds can be
detected under Attenuator fixed range in the Level menu. After setting all other parameters, the
threshold level can be detected by level variation. The level at which the attenuator fixed range changes
is the threshold. By measuring at the last level setting of one range and the first level setting of the next
range, the internal setting range borders are used. In the following, P
min
is the lowest level before
switching the attenuator, and P
max
the highest
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